of the rackets you've mentioned that babolat apdc will be the easiest to use as it has the largest headsize and is the lightest. its not really much of an all-court frame though; its designed for someone who wants to spend all their time on the baseline hitting heavy topspin groundstrokes.

the aerogel 4d 300 tour is a little heavier and has a slightly smaller headsize, so is a little tougher to use, but will give you more control. its more of an all court racket and will be nice than the apdc on serves and if you dont hit with that much topspin you'll probably like the denser string pattern.

the kblade tour is a very demanding and unforgiving racket. its great for flat hitters who dont need any help generating power and is brilliant on serves and at the net. i wouldnt really describe it as a racket to use to get back into things; a better option might be the standard kblade, which has similar specs to the dunlop, but is just a touch more powerful